Ral Zerek storm is insanely fun. That is all.
Okay, not really. Let's go over this a bit.
Oathbreaker: Ral, Storm Conduit
Signature Spell: Grapeshot
These two cards seem to be made for each other. Ral dealing 1 point of damage for each inst/sorc casted or copied, and G-Shot copying itself to deal 1 dmg on each copy? it's essentially double the damage off of a stormed G-shot.
However, since Oathbreaker is a highlander format, you have to get a bit creative in order to storm off. Hence why there are so many 0 drop mana rocks in the decklist (Mox Amber, Lotus Petal, Chrome Mox) along with 0 drop creatures (Memnite, Ornithopter, Phyrexian Walker). These just as easily count towards storm count and can provide utility for other spells that require a creature such as Paradise Mantle or Infernal Plunge.
Along with that, you have your storm staples such as Gitaxian Probe, Faithless Looting, or Serum Visions but, once again, since you can only have 1 copy per deck, in order to keep the storm swelling it's important to keep finding cheap spells, and what's better than a spell that is free? Cards such as Frantic Search, Priest of Urabrask, or Strike it Rich refund their own mana costs, along with other mana generating spells like Desperate Ritual or Seething Song providing even more mana to play with. Then there's cards that can be cheated in without mana, such as Fireblast and Gut Shot, further adding onto that storm count.
Of course, there's also spells that offer a chance to cheat in other cards from your deck, like Epic Experiment and Mind's Desire. The best part about these spells is that they can easily be copied, whether by their own storm effect or by Ral's -2 ability.
But along with that, the creatures are just as vital to the success of the deck. Baral and Kari Zev allows more cheating in of spells or gives a monkey to use as spell fodder, Baral, Chief of Compliance, Goblin Electromancer, and Voracious Reader
all discount spells, and Curious Homunculus
gives more mana to use for spells.
This deck is very fun once it gets going and has a few ways to ensure a storm off goes smoothly, such as Mystical Tutor allowing for more card fixing and Condescend able to be used either as storm fodder or protection against other counterspells. However, there are not many chances to retry a storm within a single game. Unfortunately, it's really a one-and-done deck. If you mess up a casting order or are unable to cast your G-Shot, you might as well scoop. But for that one time you manage to go off and turn your human opponent into a pile of mystery flesh as they go from 20 health to -20? It's a complete blast.
In summary: Ral Zerek storm is insanely fun.